ZIP Code 29812 — Barnwell, SC
29812 is a standard (street delivery) ZIP code serving Barnwell, South Carolina, in Barnwell County. To mail something here you only need these five digits — but the four-digit extension narrows delivery to a single point, and it is what USPS bulk postage discounts are priced on.
ZIP code 29812 at a glance
| ZIP code | 29812 |
|---|---|
| Primary city | Barnwell |
| State | South Carolina (SC) |
| County | Barnwell FIPS 45011 |
| ZIP type | Standard (street delivery) |
| Time zone | America/New_York |
| Population | 11,132 |
| Coordinates | 33.211850, -81.379110 |
How ZIP+4 works in 29812
The four digits after the hyphen encode a delivery segment inside 29812. In practice one segment usually means:
- One side of one block — odd numbers on a street between two cross streets
- A single large building, or one floor of it
- A group of PO boxes, sometimes a single box
- A single business that receives enough mail to warrant its own code
That is why 29812 has no single ZIP+4: two neighbors across the street from each other usually have different ones. Enter a street address above and we will return the exact nine-digit code along with the standardized USPS address format.
Nearby ZIP codes
Showing the closest twelve. See every ZIP code within 25 miles of 29812.
| ZIP | City | Distance |
|---|---|---|
| 29836 | Martin, SC | 10.9 mi |
| 29849 | Ulmer, SC | 11.2 mi |
| 29843 | Olar, SC | 11.5 mi |
| 29826 | Elko, SC | 11.8 mi |
| 29817 | Blackville, SC | 12.6 mi |
| 29853 | Williston, SC | 13.3 mi |
| 29042 | Denmark, SC | 14.9 mi |
| 29810 | Allendale, SC | 15.1 mi |
| 29827 | Fairfax, SC | 18.4 mi |
| 30426 | Girard, GA | 19.9 mi |
| 29856 | Windsor, SC | 20.3 mi |
| 29003 | Bamberg, SC | 20.9 mi |
Questions about 29812
What is the ZIP+4 code for 29812?
29812 is the five-digit ZIP code. The ZIP+4 adds four more digits that identify a specific delivery point — usually one side of a city block, a single building, or a group of PO boxes. Because those four digits change from address to address within 29812, you need to look up a specific street address to get them.
What city is 29812?
29812 is assigned to Barnwell, South Carolina, in Barnwell County.
Do I need to use the ZIP+4?
It is optional for ordinary mail, but it speeds up sorting and it is required for most USPS bulk-mail postage discounts. Many address-verification and e-commerce systems also use ZIP+4 to confirm a delivery point exists.
Need thousands of these?
Upload a CSV and get ZIP+4, county, carrier route, and delivery-point data appended to every row — or call the API directly.